STG global TANVAC HDV3000, Operator'S Manual

Page: 85 / 329

• Pitting and erosion from cavitation of the cylinder
liner
• Foaming of the coolant
Many additives are depleted during engine operation.
These additives must be replaced periodically. This
can be done by adding Supplemental Coolant
Additives (SCA) to Diesel Engine Antifreeze/Coolant
(DEAC) or by adding ELC Extender to Extended Life
Coolant (ELC).
Additives must be added at the proper concentration.
Overconcentration of additives can cause the
inhibitors to drop out-of-solution. The deposits can
enable the following problems to occur:
• Formation of gel compounds
• Reduction of heat transfer
• Leakage of the water pump seal
• Plugging of radiators, coolers, and small passages
Glycol
Glycol in the coolant helps to provide protection
against the following conditions:
• Boiling
• Freezing
• Cavitation of the water pump and the cylinder liner
For optimum performance, Caterpillar recommends a
1:1 mixture of a water/glycol solution.
Note: Use a mixture that will provide protection
against the lowest ambient temperature.
Note: 100 percent pure glycol will freeze at a
temperature of −23 °C (−9 °F).
Most conventional heavy-duty Coolants use ethylene
glycol. Propylene glycol may also be used. In a 1:1
mixture with water, ethylene and propylene glycol
provide similar protection against freezing and
boiling. See Tables 21 and 22 .
Table 21
Ethylene Glycol
Concentration
Freeze
Protection
Boil Protection
50 Percent
−36 °C (−33 °F) 106 °C (223 °F)
60 Percent
−51 °C (−60 °F) 111 °C (232 °F)
NOTICE
Do not use propylene glycol in concentrations that
exceed 50 percent glycol because of the reduced
heat transfer capability of propylene glycol. Use ethyl-
ene glycol in conditions that require additional protec-
tion against boiling or freezing.
Table 22
Propylene Glycol
Concentration
Freeze
Protection
Anti-Boil
Protection
50 Percent
−29 °C (−20 °F) 106 °C (223 °F)
To check the concentration of glycol, use the
1U-7298
Coolant/Battery Tester (Degrees Celsius)
or use the
1U-7297
Coolant/Battery Tester
(Degrees Fahrenheit). The testers give readings that
are immediate and accurate. The testers can be used
with ethylene or propylene glycol.
Coolant Recommendations
NOTICE
Do not use a commercial coolant/antifreeze that only
meets the ASTM D3306 specification. This type of
coolant/antifreeze is made for light duty automotive
applications.
The following two coolants are used in Caterpillar
diesel engines:
Preferred – Caterpillar Extended Life Coolant (ELC)
or a commercial extended life coolant that meets the
Caterpillar EC-1 specification
Acceptable – Caterpillar Diesel Engine Antifreeze
(DEAC) or a commercial heavy-duty coolant that
meets “ASTM D4985”, or “ASTM D6210”
specifications
Caterpillar recommends a 1:1 mixture of water and
glycol. This mixture of water and glycol will provide
optimum heavy-duty performance as a coolant.
Note:
Caterpillar DEAC does not require a treatment
with an SCA at the initial fill. A commercial heavy-
duty coolant that meets “ASTM D4985” or “ASTM
D6210” specifications MAY require a treatment with
an SCA at the initial fill. These coolants WILL require
a treatment with an SCA on a maintenance basis.
48 SEBU8312-03
Maintenance Section
Refill Capacities and Recommendations